Answered: Note: volume measurements are not very…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

In our first lab experiment we will be identifying metals by measuring their
densities and comparing them to known values. Here at NJIT we have a very large and generous
laboratory materials budget, so all sorts of exotic and extremely valuable metals will be provided
for the experiment. Using the values listed below, determine the identity of the metal samples.
If the density value determined is not amongst the values below then one of those cheap
Rutgers samples crept into our stock of metal samples and you should answer “unknown metal”.
Note: volume measurements are not very exact. If your density determination is off by 0.1 or
0.2 from the known value, that’s probably good enough for an identity.

Table in image

4a. You weigh your sample and determine it weighs 71.8 grams. You put the sample into 15.6 mL of
water and the total volume rises to 22.4 ml. What metal do you have?
4b. You weigh your sample and determine it weighs 56.3 grams. You put the sample into 28.9 mL of
water and the total volume rises to 32.9 ml. What metal do you have?
4c. You weigh your sample and determine it weighs 105.3 grams. You put the sample into 31.2 mL of
water and the total volume rises to 39.6 ml. What metal do you have?
4d. You weigh your sample and determine it weighs 71.6 grams. You put the sample into 35.9 mL of
water and the total volume rises to 44.3 ml. What metal do you have?

Metal
Platinum
Gold
Tantalum
Silver
Density
(g/ml)
21.45
19.32
16.65
10.50
Metal
Palladium
Rhodium
Plutonium
Uranium
Density
(g/ml)
12.02
12.41
19.84
18.95
Metal
Polonium
Niobium
Tungsten
Gallium
Density
(g/ml)
9.3
8.57
19.35
5.91

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